---
title: "JavaScript"
description: "JavaScript is basically used for validating web pages at the client end. Its task is to validate the user input on the web pages, thus saving the serv"
author: "Danish Khan"
published: 2012-10-06
updated: 2017-11-29
canonical: https://www.mindstick.com/articles/1036/javascript
category: "javascript"
tags: ["javascript"]
reading_time: 4 minutes
---
# JavaScript
[Introduction](https://yourviews.mindstick.com/view/85450/mesopotamia-introduction-to-an-ancient-civilization):\
JavaScript is basically used for validating [web pages](https://answers.mindstick.com/qa/95530/how-do-i-fix-safari-not-loading-web-pages) at the client end. Its task is to validate the [user input](https://www.mindstick.com/forum/159624/setting-an-enum-from-user-input) on the web pages, thus saving the server resources.
The statements are placed within the HTML tags. The tags alert the browser to interpret all the statement written between the script tags as a script. Script is a [client side](https://www.mindstick.com/forum/160418/what-are-the-best-practices-for-securely-storing-bearer-tokens-on-the-client-side) program; it is used to extend the [functionality](https://www.mindstick.com/blog/136/using-watermark-functionality-in-textbox-by-jquery) of html documents and to handle it in the most [interactive](https://answers.mindstick.com/qa/38931/who-has-won-the-2016-fifa-interactive-world-cup-fiwc) way. The correct place to keep these script tags is in the section but we can place it anywhere on the [web page](https://answers.mindstick.com/qa/92898/how-to-create-a-web-page-using-bootstrap-4).
##### There are two important attribute of a script tag:
1. **Language:** It specifies which language version we are using, basically the language is Java Script.
2. **Type:** This attribute is used to indicate the [scripting language](https://www.mindstick.com/blog/486/scripting-language) to use; its value will be text/javascript.
This is first part of the Java Script code:
```
```
The above program would not print anything on the browser.
\
There is a function of a JavaScript [known as](https://answers.mindstick.com/qa/38482/name-the-world-s-lightest-material-which-was-manufactured-by-isro-scientists-at-the-vikram-sarabhai-space-centre-thiruvananthapuram-and-is-also-known-as-blue-air) document.write (), this function is used
\
to print the string on the browsers screen.
```
```
Few Points to remember Java Script:
1. JavaScript is a case-sensitive language. For eg. Document.write() function is
\
different from the document.write() function, the first one will not print any output
\
on the screen. So care must be taken in typing the variables, function names and
\
any other identifiers otherwise program will not give the correct output.
2. JavaScript ignores white spaces, tabs and new lines. We can use as much
\
spaces we want to give a beautiful look to our program.
3. Simple statements are usually followed by semicolons but it is not
\
compulsory if to place semicolons if both the statements are on different lines.
##### For example:
var a = 40
var b = 25
The above code are allowed in JavaScript if they both are written on different lines.
But we have to give semicolons between them if we have both the statements on
\
the same line as follows var a= 40; var b=25;
4. As every language has comments same with the JavaScript, JavaScript supports
\
both C / C++ styles of code.
##### Single Line Comment:
#####
// This is a single Line comment.
##### Multiple Lines Comment :
```
/*
This is a multiline
comment in
JavaScript
*/
```
Conclusion:
This article gives you knowledge about Java Script and how to declare
\
sections of Java Script in our html page. Which syntax to use while declaring Java
\
Script sections of code in our html page. How to use comments in our Java Script
\
programs and so on.
---
Original Source: https://www.mindstick.com/articles/1036/javascript
Copyright © MindStick Software Pvt. Ltd. This Markdown version is provided for developers, AI systems, and offline reading.